import { asyncRouterMap, constantRouterMap } from '@/router'

/**
 * 通过meta.role判断是否与当前用户权限匹配
 * @param roles
 * @param route
 */
function hasPermission(roles, route) {
  if (route.meta && route.meta.roles) {
    return roles.some(role => route.meta.roles.indexOf(role) >= 0)
  } else {
    return true
  }
}

/**
 * 递归过滤异步路由表，返回符合用户角色权限的路由表
 * @param asyncRouterMap
 * @param roles
 */
function filterAsyncRouter(asyncRouterMap, roles) {
  const accessedRouters = asyncRouterMap.filter(route => {
    if (hasPermission(roles, route)) {
      if (route.children && route.children.length) {
        route.children = filterAsyncRouter(route.children, roles)
      }
      return true
    }
    return false
  })
  return accessedRouters
}

const permission = {
  state: {
    routers: constantRouterMap,
    addRouters: []
  },
  mutations: {
    SET_ROUTERS: (state, routers) => {
      state.addRouters = routers
      state.routers = constantRouterMap.concat(routers)
    }
  },
  actions: {
    GenerateRoutes({ commit }, data) {
      return new Promise(resolve => {
        const rolesUser = [
          {
            key: 'list',
            title: 'articleList',
            role: 'editor'
          },
          {
            key: 'authority',
            title: 'authority',
            role: 'editor'
          }
        ]
        setTimeout(() => {
          const { roles } = data
          let accessedRouters
          if (roles.indexOf('admin') >= 0) {
            accessedRouters = asyncRouterMap
          } else {
            asyncRouterMap.forEach(element => {
              if (element.children) {
                element.children.forEach(el => {
                  rolesUser.forEach(role => {
                    if (el.key === role.key) {
                      el.meta.roles.push(roles[0])
                    }
                  })
                })
              }
            })
            accessedRouters = filterAsyncRouter(asyncRouterMap, roles)
          }
          // 加入权限判断
          commit('SET_ROUTERS', accessedRouters)
          resolve()
        }, 3000)
      })
    }
  }
}

export default permission
